Exhibit 99

FORM 4 JOINT FILER INFORMATION

Name of
“Reporting Persons”:	InterWest Partners IX, L.P. (“IW9”)
	InterWest Management Partners IX, LLC (“IMP9”)
	Harvey B. Cash
	Philip T. Gianos
	W. Stephen Holmes
	Gilbert H. Kliman
	Arnold L. Oronsky
	Thomas L. Rosch
	Michael B. Sweeney
	Michael D. Boich
	Bruce A. Cleveland
	Christopher B. Ehrlich
	Linda S. Grais
	Nina Kjellson
	H. Ronald Nash
	Khaled A. Nasr
	Douglas A. Pepper
	Victor A. Westerlind
Address:	2710 Sand Hill Road, Second Floor
	Menlo Park, CA 94025
Designated Filer:	InterWest Partners IX, L.P.
Issuer and Ticker Symbol:	EnteroMedics Inc. (ETRM)
Date of Event:	November 15, 2007

Each of the following is a Joint Filer with InterWest Partners IX L.P. (“IW9”) and may be deemed to share indirect beneficial ownership in the securities set forth on the attached Form 4:

InterWest Management Partners IX, LLC (“IMP9”) is the general partner of IW9 and has sole voting and investment control over the shares owned by IW9. Harvey B. Cash, Philip T. Gianos, W. Stephen Holmes, Gilbert H. Kliman, Arnold L. Oronsky, Thomas L. Rosch, and Michael B. Sweeney are Managing Directors of IMP9 and Michael D. Boich, Bruce A. Cleveland, Christopher B. Ehrlich, Linda S. Grais, Nina Kjellson, H. Ronald Nash, Khaled A. Nasr, Douglas A. Pepper, and Victor A. Westerlind are Venture Members of IMP9. Ellen Koskinas, a Venture Member of IMP9 is also a Director of the Issuer, and has filed a separate Form 4 in her own name.

All Reporting Persons disclaim beneficial ownership of shares of EnteroMedics Inc. stock held by IW9, except to the extent of their respective pecuniary interest therein. The filing of this statement shall not be deemed an admission that, for purposes of Section 16 of the Securities Exchange Act of 1934, or otherwise, any of the Reporting Persons are the beneficial owner of all of the equity securities covered by this statement.

1.

Exhibit 99

Each of the Reporting Persons listed above has designated InterWest Partners IX, L.P. as its designated filer of Forms 3, 4 and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder. Each Reporting Person has appointed InterWest Management Partners IX, LLC as its attorney in fact for the purpose of making reports relating to transaction in EnteroMedics Inc. Common Stock.

InterWest Management Partners IX, L.L.C.		Thomas L. Rosch, an individual
		By:	InterWest Management Partners IX, LLC,
			as Attorney-in-Fact
By:	/s/ Michael B. Sweeney
	Michael B. Sweeney, Managing Director	By:	/s/ Karen A. Wilson
			Karen A. Wilson, Power of Attorney
InterWest Partners IX, LP		Michael B. Sweeney, an individual
		By:	InterWest Management Partners IX, LLC,
By:	InterWest Management Partners IX, LLC		as Attorney-in-Fact
	Its General Partner
		By:	/s/ Karen A. Wilson
			Karen A. Wilson, Power of Attorney
By:	/s/ Michael B. Sweeney
	Michael B. Sweeney, Managing Director
Harvey B. Cash, an individual		Michael D. Boich, an individual
By:	InterWest Management Partners IX, LLC,	By:	InterWest Management Partners IX, LLC,
	as Attorney-in-Fact		as Attorney-in-Fact
By:	/s/ Karen A. Wilson	By:	/s/ Karen A. Wilson
	Karen A. Wilson, Power of Attorney		Karen A. Wilson, Power of Attorney
Philip T. Gianos, an individual		Bruce A. Cleveland, an individual
By:	InterWest Management Partners IX, LLC,	By:	InterWest Management Partners IX, LLC,
	as Attorney-in-Fact		as Attorney-in-Fact
By:	/s/ Karen A. Wilson	By:	/s/ Karen A. Wilson
	Karen A. Wilson, Power of Attorney		Karen A. Wilson, Power of Attorney
W. Stephen Holmes, an individual		Christopher B. Ehrlich, an individual
By:	InterWest Management Partners IX, LLC,	By:	InterWest Management Partners IX, LLC,
	as Attorney-in-Fact		as Attorney-in-Fact
By:	/s/ Karen A. Wilson	By:	/s/ Karen A. Wilson
	Karen A. Wilson, Power of Attorney		Karen A. Wilson, Power of Attorney
Gilbert H. Kliman, an individual		Linda S. Grais, an individual
By:	InterWest Management Partners IX, LLC,	By:	InterWest Management Partners IX, LLC,
	as Attorney-in-Fact		as Attorney-in-Fact
By:	/s/ Karen A. Wilson	By:	/s/ Karen A. Wilson
	Karen A. Wilson, Power of Attorney		Karen A. Wilson, Power of Attorney
Arnold L. Oronsky, an individual		Nina Kjellson, an individual
By:	InterWest Management Partners IX, LLC,	By:	InterWest Management Partners IX, LLC,
	as Attorney-in-Fact		as Attorney-in-Fact
By:	/s/ Karen A. Wilson	By:	/s/ Karen A. Wilson
	Karen A. Wilson, Power of Attorney		Karen A. Wilson, Power of Attorney

2.

Exhibit 99

H. Ronald Nash, an individual
By:	InterWest Management Partners IX, LLC,
	as Attorney-in-Fact
By:	/s/ Karen A. Wilson
	Karen A. Wilson, Power of Attorney
Khaled A. Nasr, an individual
By:	InterWest Management Partners IX, LLC,
	as Attorney-in-Fact
By:	/s/ Karen A. Wilson
	Karen A. Wilson, Power of Attorney
Douglas A. Pepper, an individual
By:	InterWest Management Partners IX, LLC,
	as Attorney-in-Fact
By:	/s/ Karen A. Wilson
	Karen A. Wilson, Power of Attorney
Victor A. Westerlind, an individual
By:	InterWest Management Partners IX, LLC,
	as Attorney-in-Fact
By:	/s/ Karen A. Wilson
	Karen A. Wilson, Power of Attorney

3.